greek orgs i've never heard of

[Cartel Carter]

i haven't been a member of this message board that long, but there are many of the greek letter organizations on here that have been around a long time. many of them i see around a lot. i've also noticed a lot of greek letter organizations that seem to be made up. i would like some clarification. i would like to know if these are real greek letter organizations or something people made up so they could be recognized as greek.